Sauna exterior



FIG. 1 is a top left side exterior perspective view of the sauna of thepresent invention;

FIG. 2 is a front exterior elevation view thereof; and,

FIG. 3 is a side exterior elevation view thereof.

The broken lines shown in the drawings are directed to environment, arefor informational purposes only, and form no part of the claimed design.

The ornamental design for a sauna exterior, as shown and described.